The expression given in the question be -9p-17=10.
Move the constant terms to Right Hand Side and variables to Left Hand Side implies,
[tex]\begin{gathered} -9p=10+17 \\ -9p=27 \end{gathered}[/tex]Mutilpy throughout by -1 and find the value of p.
[tex]\begin{gathered} 9p=-27 \\ p=-\frac{27}{9} \\ p=-3 \end{gathered}[/tex]Therefore, the value of p is -3.
